Soldiers also occupied Pemex installations in the northern border city of Reynosa and in Villahermosa, capital of oil-rich Tabasco state.
The strike involves a dispute between two labor leaders vying for control of workers in Reynosa, Gaffney said.
The 15 strike-closed plants in the border city of Reynosa want the city's other 27 assembly operations to cease production in sympathy, said Don King, manager of Reynosa's West Bend plant, one of the affected companies.
The 15 strike-closed plants in the border city of Reynosa want the city's other 27 assembly operations to cease production in sympathy, said Don King, manager of Reynosa's West Bend plant, one of the affected companies.
Zenith already has major manufacturing operations in Matamoros, Reynosa and Juarez, Mexico.